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Explore Offerings by SCALER # Math Library

The C++ math library is actually C’s math library. It is easy to use and is accessed by including `cmath`.

`#include <cmath>`

### Square Root

The function `sqrt` is used to compute the square root of a number. It takes only one argument, the number, whose square root needs to be calculated.

`#include <iostream>#include <cmath>using namespace std;int main(){    int val = 10;    cout << sqrt(val) << endl;    // prints 3.16228     return 0;}`

### Powers

The function `pow` is used to​ calculate the power of a number in C++. It takes as its first argument the number itself and the value to which it needs to be raised is the second argument.

`#include <iostream>#include <cmath>using namespace std;int main(){    int val = 5;    // we use the pow function to compute the powers of the integer values given    cout << pow(val, 2) << endl;    // prints 25    cout << pow(val, 3) << endl;    // prints 125    cout << pow(val, 0.5) << endl;    // prints 2.23607    return 0;}`

### Trigonometry

To perform trigonometric operations, the cmath library provides the functions sin​, cos and tan. Each of the three takes​ only one argument, the number, on which these operations need to be applied.

`#include <iostream>#include <cmath>using namespace std;int main(){    float val = 5.7;    // here the sin, cos and tan functions are being used to compute the trignometric values    cout << sin(val) << endl;    // prints -0.550686    cout << cos(val) << endl;    // prints 0.834713    cout << tan(val) << endl;    // prints -0.659731    return 0;}`

Note: Trigonometric functions in `cmath` use RADIANS.

Try the following example in the editor below.

You are given two float variables A and B, perform the operations defined in comments in the editor below. Hints
• Complete Solution

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